The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters are normallydistributed, with a mean of 0.4 inch and a standard deviation of 0.006 inch. After recalibrating the production machine,the manager randomly selects 22 pistons and determines that the standard deviation is 0.0052 inch. Is there significantevidence for the manager to conclude that the standard deviation has decreased at the a= 0.01 level of significance?What are the correct hypotheses for this test?The null hypothesis is Ho: O = 0.006.The alternative hypothesis is H₁: 0Calculate the value of the test statistic.x² = (Round to three decimal places as needed.)exampleGet more help< 0.006.Cloor all

Sample size n =22 Standard deviation =0.0052

Answered: ton diameter of a certain hand pump is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You want to test the speed of your internet connection. You will test the claim that your average speed is greater than 4.3 Mb/s. You collect data 39 different times, and among that sample, the average speed is 4.9 Mb/s. Assume internet speeds are normally distributed with a standard deviation of 1.1 Mb/s.a. State the null and alternative hypothesis for the claim that your average speed is greater than 4.3 Mb/s. Ho: ? ___4.3 Ha: ? ___ 4.3 Please explain to me how you determine the sign that goes into the blank space. b. The (null or alternative) hypothesis is the claim c. The goal of the test is to (support or reject) the claim.
In order to test the claim that the mean drive speed (Km/hr) of adults in a known highway in a city is at most 75 Km/hr, a sample of 40 adult drivers was taken and resulted a sample mean of 85 Km/hr. If the population standard deviation is 35 Km/hr, perform the test with a level of significance a = 0.05 using the P-value approach. 1. The mull and alternative hypotheses are A. Ho : u 75 and H : u 75 D. Ho : 2 75 and H, : p< 75 2. Test statistic value = (approximate to two decimal places) D. 1.81 A. -1.81 B. 0.29 C. 0.29 3. P-value = A. 0.0702 (approximate to four decimal places) B. 0.1404 C. 0.9298 D. 0.0351 4. The decision of the test: A. Reject Ho, there is a strong evidence that the adults mean drive speed is less than 75 Km/hr. B. Do not reject Ho, there is no evidence that the adults mean drive speed is more than 75 Km/hr. C. Reject Ho, there is a strong evidence that the adults mean drive speed is more than 75 Km/hr. D. Do not reject Ho, there is a strong evidence that the adults…
Determine the null and alternative hypotheses based on the following: The standard deviation in the pressure required to open a certain valve is known to be s = 1.1 psi. Due to changes in the manufacturing process, the quality-control manager feels that the pressure variability has increased.
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 754 hours. A random sample of 30 light bulbs has a mean life of 732 hours. Assume the population is normally distributed and the population standard deviation is 62 hours. At a = 0.05, do you have enough evidence to reject the manufacturer's claim? Complete parts (a) through (e). Zo = - 1.65 (Use a comma to separate answers as needed. Round to two decimal places as needed.) Identify the rejection region(s). Choose the correct answer below. O A. B. O C. Fail to reject H- Fail to reject Ho Fail to reject Ho- Reject Ho Reject Ho Reject Ho Reject H,- -4
It is claimed that the average household in Thunder Bay uses more than 1170 kWh of electricity each month. To test this claim, you carry out a small survey of 25 households. The survey finds an average consumption of 1225 kWh with a standard deviation of 150. Using an alpha value of .01, what conclusion can be reached?
A random sample of 100 observations from a population with standard deviation 39 yielded a sample mean of 107. Complete parts a throughc below. a. Test the null hypothesis that u = 100 against the alternative hypothesis that u > 100, using a =0.05. Interpret the results of the test. What is the value of the test statistic? (Round to two decimal places as needed.) z=
The average American consumes 86 liters of alcohol per year. Does the average college student consume more alcohol per year? A researcher surveyed 10 randomly selected college students and found that they averaged 92 liters of alcohol consumed per year with a standard deviation of 16 liters. What can be concluded at the the αα = 0.05 level of significance? The null and alternative hypotheses would be: Ho=?H1=? The test statistic t=? (please show your answer to 4 decimal places.)
U.0 of 15 pts 2.5.49 Question Help A certain brand of automobile tire has a mean life span of 36,000 miles and a standard deviation of 2,100 miles (Assume the life spans of the tires have a bell-shaped distributon) (a) The life spans of three randomly selected tires are 35,000 miles, 38,000 milos, and 31,000 miles. Find the z-score that corresponds to each life span For the lfe span of 35,000 mies, 2-score is (Round to the nearest hundredth as needed)
Only need help with finding tcalc.
Assume a significance level of a = 0.1 and use the given information to complete parts (a) and (b) below. Original claim: The standard deviation of pulse rates of a certain group of adult males is more than 11 bpm. The hypothesis test results in a P-value of 0.3373. -C a. State a conclusion about the null hypothesis. (Reject Ho or fail to reject Ho.) Choose the correct answer below. O A. Reject Ho because the P-value is less than or equal to α. OB. Reject Ho because the P-value is greater than a O C. Fail to reject Ho because the P-value is greater than a O D. Fail to reject Ho because the P-value is less than or equal to a. b. Without using technical terms, state a final conclusion that addresses the original claim. Which of the following is the correct conclusion? O A. There is not sufficient evidence to support the claim that the standard deviation of pulse rates of the group of adult males is more than 11 bpm. O B. The standard deviation of pulse rates of the group of adult males…
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Assume a significance level of α=0.01 and use the given information to complete parts (a) and (b) below. Original claim: The standard deviation of pulse rates of a certain group of adult males is more than 19bpm. The hypothesis test results in a P-value of 0.3876 A . State a conclusion about the null hypothesis. (Reject H0 or fail to rejectH0.) Choose the correct answer below. A. Reject H0 because the P-value is greater than α. B. Fail to reject H0 because the P-value is greater than α. C. Reject H0 because the P-value is less than or equal to α. D. Fail to reject H0 because the P-value is less than or equal to α b. Without using technical terms, state a final conclusion that addresses the original claim. Which of the following is the correct conclusion? A.There is not sufficient evidence to support the claim that the standard deviation of pulse rates of the group of adult males is more than 19 bpm. B. The standard deviation of pulse rates of the group of…

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